What are the ways of increasing Digimon Lifespan?

[Alantor32]

Hi, My Digimon partners reached Age 16 or 17 and died after I got to the point of where I have the ability to upgrade Floatia. What are the ways of increasing your Digimon's lifespan before you get the life expanding drinks?

[Elvick_]

The area right before MOD Cape has a Palmon recolor who will sometimes give you boosts to lifespan [and other stat boosts daily]. Not sure when it does, if it's a specific day or what. There's the trainer skills obviously. And just keeping them happy afaik. I always get to 20, unless they end up in a 'unknown' instead of an Ultimate > Mega. MarineAngemon will transfer life from one to the other, he's in the desert oasis-y area first, then later on he's on MOD Cape somewhere.

[Shiorayne]

I'm not sure which things you actually can unlock right now and which you can't so I'll just list whatever comes to mind right now. Marineangemon and Seraphimons food have already be mentioned. The Tamer Skills are probably well known too. There are also "rotten melons" or something like that which will increase your lifespan. And I think I saw a fish once that also increased their life. I'm not too sure about the last one though.