Welcome I hope you enjoy your time here! Congratulations on adopting Lilah!
She's beautiful. Thanks for giving her a soft place to land. Is there any thing specifically that you are worried or concerned about with adopting an older bird?
Generally speaking it can be hard to age a bird unless you having a decent history on them, with rescues that can be hard to come by sometimes. I'd say 30, well certainly not young, isn't terribly old for a Grey.
But sometimes rescues have been through alot and the stress and hardships they have endured can prematurely age them. Does Lilah have any current health problems you are concerned about?
I loss my rescued moluccan this year. He had a pretty sketchy background but he was estimated to be a senior when he was found and when he passed we thought he was around 75. So I do know a little bit about owning older birds. What I can tell you about adopting an older bird is their personalities tend to be more settled and predictable. It's also not impossible to change bad habits or behavior problems if there is any. It may take some time. And all birds are individuals so that factor in too. But you can certainly create a good relationship with a strong bond with an older bird.