I'd say the differences really are that it is relatively more important to keep track of the bloodwork; if still having good natural T production it's even more important to take care with it which I take to mean using shorter cycles (no more than 8 weeks) and avoiding Deca; and optimum point for rewards vs downsides probably tends towards a more moderate dosage.
E.g., at age 50 400 mg of Primo could be extremely satisfactory, whereas for a 25 year old looking for maximum gains, I wouldn't recommend it.
Not that more than this can't be used, certainly it can, and not that this is the only type of cycle to do, it's certainly not. Rather it's an illustration of the difference in experienced benefit / reward.
The 25 year old is saying "I've only gained an inch on my arms with my cycles over the last year" and is disappointed.. the 50 year old may be saying "I'm looking every bit as good muscle-wise as I did 10 years ago (or if this is a first cycle, likely better!) and I did it with only this" and be quite happy.