Did Mickey have one great fight left in him?

Mickey (Burgess Meredith) was 68 when the first Rocky was released. Rocky (Stallone) was 60 when Rocky Balboa was released. So only an 8 year difference. So, do you think hypothetically Mickey could have trained for a professional fight around the same time the Rocky series began? You can't count him out because he had knowledge, experience, and wisdom and also there is the factor of "old man strength. Thoughts?