I am and I've never been happier!
We used to practice D/s light, and just generally being kinky, since we first met and things have gone up and down during the early childrearing years. However, as kids now are late teens and both at University we have rediscovered that side of our relationship - things are really great. we are now thinking about dipping out toes in the community and making friends in real life with people who have chosen to live like this, although we are fully monogamous and - emphatically - not looking for play partners.
We also paired it with kink-aware couple therapy and honestly it has been transformative. I am in my late 40s and my partner mid 50s.
We have been married for over 20 years.
edited: typo