Should I worry about this

[gtnate]

Some of the older leaves near the bottom of my stupice plant are beginning to roll up and get a few yellow spots on them. I have attached a pic of the leaf near the bottom of this post. Additionally, these leaves seem to be a bit frail (for instance, I ripped one of the leaves trying to unroll it to take the picture).

The new growth looks great, it is vibrant green. The plant also seems to be flourishing otherwise. However, I am still worried about the yellowing leaves near the bottom.

Can anyone tell me if this is normal, or if I should try to do something to alleviate this problem?

Thanks,
Nate