Wedding Cake [Auto, Barney's, Solo]

The plant has been pushing out buds like crazy and still blooming. It's not really stressed out. The environment it's in is pretty stable, not much changing. During all this time, the power only cut out 3 times for a few hours. Humidity and temperature are within comfy levels, following the VPD chart. I've been fertilizing it pretty gently. Harvest is still a long way off, but for some reason, the plant seems to be "aging" rapidly: I'm seeing lots of old yellow leaves with brown spots, almost all new leaves are getting brown tips. I'm worried the endgame might be a downer.