Is there any way to MAKE Kobe retire after Season 1?

Simple question.

Maybe a "Potential" or "Peak age" Edit would do the trick....

What i did was change his actual age to 45 using the limnono trainer.

If you're playing MyLEAGUE, you should be able to do that manually in-game as well.

and if I want that he retires in MyCareer? in 2K15 he doesn't retire even after 2017-18 season, and all this years he signs new 1 Yr 8M contract every season but with different teams.

You'd have to use the trainer, I'd imagine. More info on that can be found in the Tutorials section.

In your roster lower his 'Play For Winner' and 'Financial Security' numbers to '0.' Leave his loyaltly at '99.'

With those settings I had him retire after season 1 in MyGM without using Limnono. Part of it is also how successful the Lakers team is. If they are decent in season 1 he will stay around to try to get a chip. If they are garbage then he will retire, which is quite realistic. If Lakers were a playoff team he wouldn't be retiring this year IRL.

Good to know, thanks for the info!

No prob! I noticed the team success with the 0-0-99 ratings work for Dirk, Duncan, Pierce, and K.G. as well.

Sounds like it's the way to go, then.