Please have a look on the following scenarios and let me know what is the current English equivalent for the meaning in my question that can be used to fill in the blanks:

Please imagine a couple including an old man and a young person are hiking in a mountainous area! The young man cannot keep up with the older man! The young says: Hey; you're so strong! I'm not able to walk as fast as you do! The older says: heh; you know! .................................

or

• Did you see how the grandmo danced yesterday? She was better than everyone else! Even youths couldn't dance like her! Somebody eslse says: yea! .......................

There is a proverb in my language which can be used in such occasions, which leterally says: a log smokes.

connotation: a log (a thick wood) will smoke more tha just a narrow wood piece (a young person); meaning that although one is old, but older prople are sometimes more experienced and better than any other youth!

I have found three English alternatives which I found it a bit of a translated type of some other languages:

• A creaking door hangs longest.
  

• The life is between the old dogs yet.
• There's many a good tune played on an old fiddle.

Please have a look on the following scenarios and let me know what is the current English equivalent for the meaning in my question that can be used to fill in the blanks:

Please imagine a couple including an old man and a young person are hiking in a mountainous area! The young man cannot keep up with the older one! The young says: Hey; you're so strong! I'm not able to walk as fast as you! The older says: heh; you know! ................................. (said humorously)

or

• Did you see how the grandmo danced yesterday? She was better than everyone else! Even youths couldn't dance like her! Somebody eslse says: yea! .......................

There is a proverb in my language which can be used in such occasions, which leterally says: a log smokes.

connotation: a log (a thick wood) will smoke more tha just a narrow wood piece (a young person); meaning that although one is old, but older prople are sometimes more experienced and better than any other youth!

I have found three English alternatives which I found it a bit of a translated type of some other languages:

• A creaking door hangs longest.
  

• The life is between the old dogs yet.
• There's many a good tune played on an old fiddle.