I think as guys get older you will see their dosages get lower and lower

...And eventually many will just turn to HRT at 150-200 mg/week, permanently...
What you may find as you get older is that you might do one cycle a year at maybe 400-600 mg of TOTAL gear and that's it...And be happy with that...
I know my dosages are progressively getting lower and lower each time
I thnk GH IS better the older you are, and most guys (non competitors) under 30 probably have little use for it...

But as far as its effects being more "permanent", I really cant say for sure as I have still yet to use it

...
Though I would venture to say that yes its effects are probably longer lasting...But remember it can offer ALOT of other benefits like improved skin tone, skin elasticity, and a general youthful feeling that gear may or may not give you...