35 days post flip isn't too early to see it... there's variety in how this all progresses.
some things to consider -- wind, excess light, excess heat, any pollen sacs? if that doesn't sound like the case, i wouldn't worry.
As far as any degredation in the leaves, the rate at which it progresses is the concern. Just make sure the canopy doesn't die before it can finish. It's fine to be trending that direction as you near harvest, but don't over-do it... no measurable benefit to support the anecdote.