I'm 63 and workout with heavy weights multiple times per week. seems i've plateaued but i would like to get pec implants and calf implants for a more complete look. can i get both done at the same time?

What do you expect to get by getting these implants if such were available? It would be better for you to talk to a psychiatrist about your though process for wanting to get potentially dangerous surgery without any reason.

It is very possible the exercise program chosen might not allow for further development. Are you looking for strength or size? A sports medicine physiatry Or professional bodybuilder, or other sources might be able to help you. Implants are discouraged only create problems.