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No one thinks an artist sold out for changing their style, people think artists sell out for watering down their style in an effort to appeal to the masses and sell more records/tickets/whatever.
I understand the concept of "selling out" as, when a band becomes succesful and changes styles to cater to the mainstream for the sake of maintaining their popularity status and commercial success. 
Which is different than to say "down the line, after many years, a band will get old and change their style to fit their new artistic priorities". Thats an entirely different thing. And its normal. >

People don't even know what selling out means. People say someone sold out simply by doing something they personally don't like. Selling out by definition means doing something immoral or against your beliefs for money. >

I think accusing a band or artist of selling out is just an attempt at gatekeeping based on jealously. >

Or, if not jealousy, people just resisting change. >

Toughie there, cause a lotta bands do a lotta things for a lotta reasons.  I do believe that selling out has happened, and I'd be interested in seeing a list of soldout bands.  I'll start the list with green day. >


Im in my late 20s doing a totally different career than I did 5 years ago. Did I sell out? 

yes.
but that's what selling out is.
working for an engineering company for a paycheck = selling out (in my case).
art is different though. there are two ways an artist can "sell out". either people can respond positively to their art and they can sell it. OR they can get a job working for mcdonalds writing songs for mcdonalds. one has a little more integrity than the other.