Maximum lifespan: alone or colony?

Hey guys,
i recently purchased a group of females that I am planning on keeping in a 40 Breeder as a colony (3 females). I also bought my prize male that I will be using on the group. He is worth a lot and I would like for him to be ab Breeder of mine for 20+ years. I am debating putting him with the females permanently in the 40 or getting him a 20 long alone and mixing him in when I would like to breed him. I am fine with breeding at any time as I have an incubator running year round. Wondering what you guys thing will allow him to live the longer lifespan. Would appreciate the advice.

Ok let's start off by saying I've never owned a Leo for 20 years but
I don't think for males colony vs alone or breeding vs not breeding will
Have any major effect on life span as it could in females.
As a former breeder of Leos I would replace my males about
Every 2 to 3 years to insure maximum performance . I would expect potency
To diminish as the gecko ages . I can't say exactly when you would see
any kind of drop off in production but 20 seems like a bit of a stretch
Kirk