I am 70. Would CO2 laser treatment be a good choice?

Without any photos or history, it is impossible to answer this question appropriately, but from an age perspective, you are never too old for a CO2. Some of the best results come with patients well above 80, who have the most damage amenable to correction. 

Hello.  Thank you for your question.  It is hard to answer this question because you did not indicate your concerns and goals for treatment, and there are no pictures provided.  CO2 laser skin resurfacing is helpful for improvement of facial wrinkles and sun-damaged skin.  If these are your concerns, it is likely that CO2 laser would be helpful.  However, you would need to be evaluated by a physician skilled in this technique to determine if this is the best option to achieve the goals that you seek.  I hope this information is helpful.