Gorgeous girlies! Well done you for taking them in. Our cats are 8 now too! They're just as hyper when they are active as when they were younger just in much shorter bursts!
The longer I've owned both cats & hamsters, the more I realise they're actually pretty similar personality wise. Think it's why I love them both. A little bit aloof, definitely your friend when you've got food & they'll decide when they want to play with you or be affectionate. Basically, teenagers in furry form