I can appreciate your problem; now that I'm in my late 80s, I too find it hard to get to church as often as I would like. When I can't get out, I am thankful I can watch a service on television from a nearby church.
At the same time, I hope you won't lose your connections with your church. You don't say how big it is, but if it is fairly large your pastor may not even be aware you aren't coming now. I'm sure he would appreciate a brief note from you, explaining why you no longer can attend but expressing your continued interest in your church's work, and also inviting him or others on the staff to visit you. When we know Christ, the Bible says, we are "members together of one body, and sharers together in the promise in Christ Jesus" (Ephesians 3:6).
Don't forget to pray for your church either; as we grow older, prayer may be the most important service we can perform. In addition, continue to support your church through your giving; God can take even the smallest amount and use it for His glory.
Most of all, as you grow older learn to see each day as a special gift from God a day He has given you to serve Him. Commit it to Him and ask Him to help you draw closer to Him. You may not be able to do everything you once did, but God is with you, and His love never fails.