Let's say I have a twin who is at rest relative to myself and ten light years away from me, we are both in rocket ships. We have agreed that I will send a laser pulse and that when he receives it we will both accelerate to 80 percent speed of light (quickly) towards each other.
I fire off my laser pulse and wait ten years for my twin to receive it and then fire up my engines. Time dilation and length contraction are experienced during the trip. We underwent the same acceleration and time is going slower for my twin relative to me, and likewise from my twin's viewpoint time is going slower for me.
When we pass each other and look through our windows, who will have aged more?
Thanks in advance far any considerations.