I started at 40. I get it three times a year just in my forehead.
It instantly makes me look less tired, which is the look I am going for lol.
I had an honest conversation with my injector about what I was comfortable spending. I get 60 units of Dysport and it looks fantastic.
I keep a spreadsheet of how much I pay and when I get it. I keep my eye out for deals at my place. For example they just ran a buy $100 gift card, get $50. So I bought two of those and will get $100 off at my next appointment.