experienced

ex|pe|ri|enced /ɪksp'ɪəriənst/
[ADJ] oft ADJ in n/-ing
If you describe someone as experienced, you mean that they have been doing a particular job or activity for a long time, and therefore know a lot about it or are very skilful at it.
...lawyers who are experienced in these matters...
It's a team packed with experienced and mature professionals...