BjjBrick Q&A 2 Lower Back Pain and BJJ

I’m am a fresh blue belt age 40,
started Jits late, but it has changed
my life.
Is lower back pain normal when
starting this? I’m assuming it’s due
to posture from guard ect.
Injuries seem to slow my progress. Don’t
want to blame age but just a question.
Thanks and love ur vids.