Is it too late to start martial arts at age 37?

No, it's not too late BUT for example, Muay Thai fighters are in their prime in the 30's and they have fought for many years. Thais start fighting usually before age 10. You can definitely pick up Martial Arts but you'll always have the slight disadvantage

it is never to late, im 36. took martial arts when i was 12 to 17. stopped for 18 years. started again a few years ago from scratch. who cares how old you are, does it make you happy? are you able to get better than you were yesterday? maybe you will not be a world champion but maybe you can be better than you were yesterday,

No, I have had guys in their late 50's begin their martial arts training with me.

It is never too late to start any sport. I have friend started muaythai+bjj at the age of 38

It is never too late, my newest Baguazhang student is 55 and my oldest student is 81!

it's never too late. My aunt took it up at 42

Thailand is the ultimate art

If you have no medical conditions that precludes it, then no.

No.