I agree 100% with Karin.
As a boot camp instructor and a woman over 50 I can tell you first hand that you need not change the exercise selections just because you have older participants.
You take those exercise selections and modify if they are deconditioned and
being older does not necessarily mean that you are! I have a 67 yr.old in my class that puts the 30-something yr old to shame with the amount of pushups he can do!
I run my boot camp class as a circuit with stations for each exercise. Each week this changes. I may pair up exercises as a superset (opposing or same muscle group) 1 min ea. with a 15-20 sec rest to switch to next station. I add variety by introducing different exercise apparatus at each circuit (especially if you don’t have enough for each person) So I may have a TRX, Bosu, Medicine Ball, Body Bar, Stability Ball, etc….at each station with a description of each exercise to be performed. I go to each station and offering modifications, whether to make the exercise more challenging or less.