Yes its that age all opinion questions. So the rules are you can use anything from the latest stuff but only class and race. no archetypes or legendary artifacts or such. Surprisingly my answer is the same despite all the updates. elf - druid. Elf because your generally good looking and you live long and you are still pretty common and don’t have to worry to much about some sort of outcast type of position. Then druid because the primal list is so useful and broad. You got healing and combat and a decent amount of buff/debuff. It mainly loses on telepathy, telekinesis, and teleportation along with undead and illusions. Then leaf druids start with a familiar which is way useful and goodberry which is a great focus spell giving both tons of healing and sustenance usefulness supplementing something the primal group gives you plenty of so it just becomes not a concern now. Then pick up wildshape and that is just tons of utility. Top it off that if you can get far enough in your class that you can stop aging.
I guess I sorta lump all the reincarnated and such all together and since ancestry has a fair effect on abilities I figured I would do it. I totally might be using the phrase wrong.