Here you will see how to add logging of method calls with Spring.
On every call you can log method name, method arguments, returned object, as well as method execution time.
So you can use AOP as a profiler, where you can check where are the bottlenecks of your application.
If you are concern if introducing of Spring AOP decrease performance, as you are adding overhead to execution of all your service calls, check this blog post.
But the best part of this age group is being free from social prejudice.