Bass can live 25 years, spawning 15 times and grow to over 20lbs.
Male fish do not grow large
The current MLS (36cm) is well below the age of spawning
It's interesting that bass shoal together for life. As the shoal gets older, it gets smaller as shoal members get taken, leading to the claim that big bass are solitary. They are not, just lone survivors (before intensive exploitation, if you hooked a big bass, you'd most likely catch another if you cast again quickly)
Young bass tend to be nomadic, but settle down in one locality as they get bigger. If you want to keep catching big bass, put them back and tell no one. When word gets out, it's not long before all the big bass that live there are taken, gone forever.