I agree with @mikeneverwired, I had an ascending TAA which was discoved after I broke my leg riding my MTB, I was 54yo (4 years ago). Mine was 5.2 cm , I had surgery 2 months later as I had to wait for the leg to heal a bit from the surgery. Surgery is not pleasant but went completely unventful, out of hospital in 5 days, back to work in 3 weeks (the accident saved my life).
I was (still am) very active, spinning, biking, weights, hot yoga, never smoked, ate healthy and that contributed a lot to the successs of the surgery (surgeon gave me >99% probability of no complications). The main caution my Cardiologist gave me before the surgery was related to weights, but mainly for the reason that has been stated before, when lifting heavy weights we tend to hold our breath and grunt and that causes spikes in BP ( he also mentioned crunches too, we tend to hold our breath when doing abs). Sometime ago I shared a podcast in this forum from Andrew Huberman and Andy Galpin that explains very well the effect on BP from holding your breath, it is online among the Huberman Labs podcasts.
Just think you are one of the lucky ones that finds out they have it and can do something about it. Stay active and keep taking care of your body. Beyond that my main advice is to find a good Cardiologist, one that is an expert in aneurysms, not all of them are. Once you find one, stay on top, ask a lot of questions, mine is incredibly receptive and super helpful. Remember that the 5.0cm reference size is just that a reference, there are other factors, body size, etc that will determine when and if surgery is needed.
Good luck to you and if there any questions I can answer let me know.