The first is a frostiron fic Tony is gravely injured during a battle and Loki goes to Asgard to bring him back a healing stone but Odin refuses. Frigga gives him a golden apple hoping it would help. Bruce spoon feeds the mashed up apple and it takes a while but it works and Tony is healed. Later I believe Loki offers him another golden apple to make Tony immortal. At first he refuses but later he does decide to eat the apple. IIRC he enjoys watching their children and the children of the other avengers grow up.
The second fic I am looking for is one where Tony is somehow deaged. I can't remember too much from this but what I do remember is him saying something about wanting Jarvis. The avengers find out he's alive in a nursing home and ask him to come back to take care of Tony. He does and moves them out of the tower and into the mansion. I remember Clint saying something along the lines of if you have a mansion why are we living in the tower.
Please help I've been looking for these 2 fics for about 2 years now maybe longer.