What do you mean by physiologic plateau? Do you mean your genetic potential, beyond which you cannot get any stronger? Most people won't ever reach this point as it requires extremely dedicated training with no setbacks. If you are referring to the point at which age prevents you from adding weight to the bar, you'll likely want to see exactly where you are at when that happens. You'll want to look back on your training and see what you liked/didn't like, what lifts moved along easily/which ones did not, how often you now want to train at that point, etc. There are then various options where you can deload certain lifts a bit and build back up, possibly in a different way, with some different exercises and also doing a bit more accessory work to manage systemic fatigue.