I thought this was awesome, as I have long been a proponent of our slightly older citizens enjoying the benefits of our art-form.
The UK Group Parkour Dance has made such a thing happen. They were invited to give a special Parkour for seniors or "Pensioners" as they call it at the Gwanyn Arts Festival in Wales this year. While they mostly stayed low to the ground, it looks like the Pensioners thoroughly enjoyed it. As it turns out, the group also has a regular weekly class for seniors in South London.