Running a full marathon? If so, long run should be a 20-21 miler. If not, you are probably pretty close to long run distance, but my advice would be to Google marathon training plans.
If I remember correctly from W's training, taper is last week to 10 days.
Me - Mid 40's W - Mid 40's Married 20 No kids BD - 7/2015 ILYB... Moved out 2 days later Suspect EA