Dump desserts and drinking. Consider sugar your enemy.
Consume all your calories between noon and six pm. and reduce carb intake. Stop snacking completely. Try to drink a gallon of water every day.
Weigh yourself daily and do some jumping jacks naked in front of the mirror.
Set a timer and get up and move for 5 minutes every hour. Use that time to exercise, 10 perfect pushups and 10 crunches 10 times/day is not a bad or difficult thing. The next day do air or goblet squats and lunges. Stretch bands are cheap and effective, mix it up.
Core strength should be your 1st priority.
A home gym is an investment in yourself and slays excuses. It will allow you to achieve both muscular and cardio endurance.
Mobility, agility, balance and muscle mass/strength decrease with age and can be resisted with appropriate effort.
Weak people are generally less useful.
Never give up.Good luck.
mike r