At 22 i got diagnosed with degenerative disk disease in l5. it's painful when i first lay down until it adjust. is my pain going to get worse with age?

Likely, but: It may be slowed by maintaining a desirable weight, bone health, healthy diet, sufficient sleep, possibly supplements, not smoking, core muscle strengthening, proper posture, ergonomics, injury prevention, etc. If symptoms persist and condition severe, treatment with regenerative medicine may be an option to consider in the future.

Not likely.: Degenerative disc disease is not a disease. It is a radiographic diagnosis describing age related changes on a scan. Your back pain may or may not be related to your MRI findings. No treatment is necessary.