Mike and I are on this site. Mike is 40 years old w/ DMD. I am his "significant other". We would be happy to chat w/ you. It has been our experience that there are not too many older people w/ DMD here or their families-- but it is still a fabulous organization.
Why don't you join the group Living with Duchenne for 18 plus? Then give it some time for more to join. This community is rather new so it might still take some time. If you know anyone else, invite them to join. Also, us parents would love your advice, etc as we help our sons on this journey that you have already been through. Thank you for joining.