1 Keeper for next year

So now that our season is done I’m looking at next year. We are in a 12 team PPR keeper league. We can keep a player for as long as we’d like. Here are my options, who to keep?

Derrick Henry (age is my concern)
JK Dobbins
Travis Etienne

I have a good chance of 1st overall so could take Henry again if I get it, will find out after this week.