I will be 72 in 3 weeks.
I shoot HFT with bucket and sticks.
My FT arsenal is:
1720T Crosman Pistol
I use a 5 gallon bucket.
6 gallon buckets are available and a bit higher.
I use Gen I PRIMOS sticks that have the lower portion removed and a 18" PVC rod put on for just a bit more height.
The height of the sticks should be based on the height needed so you may rest both of your elbows on your knees while sitting and still control the butt stock and the forearm.
If Photoshop was allowing me to post, I would post my setup.
But, I think you can figure it out.
Too, if there is a FT match nearby you might want to go and visit.
There are many YouTube videos you can watch too.
When I am out shooting ground squirrels/prairie dogs with the air rifles or the powder burners I use the bucket/stick setup so I don't sit on any cactus plants, etc.