fix 'age' stat for stats items
fix 'age' stat for stats items

credit goes to anton.yuzhaninov for the report and patch

angusfenying/memcached-win64,kamyu104/memcached,myPublicGit/memcached,Dhruva6/memcached,dormando/memcached,cloudrain21/memcached,zaycev/memcached,niaomingjian/memcached,jeremiahyan/memcached,ZhangZhenhua/memcached,angusfenying/memcached-win64,ClearwaterCore/memcached,Distrotech/memcached,sagark/memcached-accel,leverich/memcached-affinity,Distrotech/memcached,sagark/memcached-accel,leverich/memcached-affinity,romanticode/memcached,samanbarghi/memcached,13693100472/memcached,ClearwaterCore/memcached,allen8807/memcached-1,tmharrisonwang/memcached,dustin/memcached,xiaosl/memcached,ZhangZhenhua/memcached,dormando/memcached,zaycev/memcached,fengshao0907/memcached,neutronsharc/memcached,romanticode/memcached,mdounin/memcached,13693100472/memcached,elfchief/memcached,tellapart/memcached,angusfenying/memcached-win64,leedc/memcached,allen8807/memcached-1,williamcheungthu/memcached,ClearwaterCore/memcached,xiaosl/memcached,Danzeer/memcached,msg7086/repcached,kamyu104/memcached,Dhruva6/memcached,alexandermerritt/memcached,dustin/memcached,rhli/memcached,tmharrisonwang/memcached,romanticode/memcached,memcached/memcached,tomykaira/memcached,cloudrain21/memcached,surajdharmapuram/memcached,guikcd/memcached,fengshao0907/memcached,samanbarghi/memcached,allen8807/memcached-1,xiaosl/memcached,elfchief/memcached,williamcheungthu/memcached,guikcd/memcached,cloudrain21/memcached,msg7086/repcached,msg7086/repcached,EdwardLee03/memcached,guikcd/memcached,ZhangZhenhua/memcached,leverich/memcached-affinity,sagark/memcached-accel,EdwardLee03/memcached,DSrcl/memcached,williamcheungthu/memcached,memcached/memcached,memcached/memcached,EdwardLee03/memcached,cloudrain21/memcached,zaycev/memcached,rmccullagh/memcached,williamcheungthu/memcached,neutronsharc/memcached,amyvmiwei/memcached,myPublicGit/memcached,romanticode/memcached,dustin/memcached,xiaosl/memcached,tomykaira/memcached,DigitalAce/memcached,dianerdianer/memcached,Dhruva6/memcached,rhli/memcached,leedc/memcached,niaomingjian/memcached,samt42/memcached,Danzeer/memcached,tomykaira/memcached,dkrotx/memcached-dd,mitliucak/memcached,jeremiahyan/memcached,neutronsharc/memcached,rmccullagh/memcached,emcconville/memcached,13693100472/memcached,tomykaira/memcached,alexandermerritt/memcached,jeremiahyan/memcached,guikcd/memcached,amyvmiwei/memcached,sagark/memcached-accel,myPublicGit/memcached,tellapart/memcached,dormando/memcached,DSrcl/memcached,alexandermerritt/memcached,gencer/memcached,Distrotech/memcached,dormando/memcached,amyvmiwei/memcached,DigitalAce/memcached,tmharrisonwang/memcached,kamyu104/memcached,emcconville/memcached,jbergstroem/memcached,dianerdianer/memcached,memcached/memcached,elfchief/memcached,kamyu104/memcached,emcconville/memcached,DigitalAce/memcached,mdounin/memcached,allen8807/memcached-1,guikcd/memcached,dkrotx/memcached-dd,samanbarghi/memcached,elfchief/memcached,surajdharmapuram/memcached,mdounin/memcached,bpzhang/memcached,bpzhang/memcached,ClearwaterCore/memcached,samt42/memcached,Dhruva6/memcached,msg7086/repcached,gencer/memcached,ZhangZhenhua/memcached,surajdharmapuram/memcached,amyvmiwei/memcached,leedc/memcached,emcconville/memcached,niaomingjian/memcached,gencer/memcached,rmccullagh/memcached,leedc/memcached,13693100472/memcached,EdwardLee03/memcached,tmharrisonwang/memcached,Danzeer/memcached,bpzhang/memcached,dkrotx/memcached-dd,sagark/memcached-accel,fengshao0907/memcached,samanbarghi/memcached,myPublicGit/memcached,niaomingjian/memcached,rhli/memcached,jeremiahyan/memcached,surajdharmapuram/memcached,zaycev/memcached,neutronsharc/memcached,angusfenying/memcached-win64,alexandermerritt/memcached,memcached/memcached,rmccullagh/memcached,gencer/memcached,mitliucak/memcached,rhli/memcached,dkrotx/memcached-dd,bpzhang/memcached,DSrcl/memcached,Danzeer/memcached,dianerdianer/memcached,fengshao0907/memcached,samt42/memcached,dianerdianer/memcached,gencer/memcached,mitliucak/memcached,dormando/memcached,samt42/memcached,13693100472/memcached,tellapart/memcached,elfchief/memcached,mitliucak/memcached,msg7086/repcached,jbergstroem/memcached,rmccullagh/memcached,DSrcl/memcached,jbergstroem/memcached