Your age, has a bearing on any aspect of training because it can influence your rate of recovery, both short term - such as getting your breath back, through to development of physique.Your age is exactly right for developing endurance, you will probably be able to recover from moderate training within 48 hours - which means alternate days.
If you overtrain you can become weaker rather than stronger.
The yoga is a superb instrument to assist in recovery on your rest days.
I assume that if you are intending to road race then you must be capable of riding at better than evens for at least 15-20 miles( 20mph for all you non competition riders)
I am also assuming you are capable of riding around 40 miles without rest and over 70 with a break.
This would be a baseline for an off season competitor.
This is the level you need to attain before seriously training for race pace.
I would seriously consider dropping the running, its ok for winter maintenance - something around 4-5 miles at 8 to 9 minute mile pace twice a week, but you would also need to be pretty near to race fitness, otherwise you are spreading your training effort too wide.
If you intend to use weights, then I advise that you do the power work rather than strength - this means lots of repetitions within a set time period, followed by a fixed rest period. Its often useful to use cardio monitoring for this - once it takes longer than 90 seconds to recover to 80% of your max allowable heart rate. You train at a load intensity of 80% of your max weight capacity. As soon as you take longer to recover, you stop.
You have an awful long way to go, I think you should re-evaluate your targets. What sort of times are you doing in that 90 minutes, and what sort of distance?
An off season rider at the lower levels should be able to knock out 25 miles in 90 minutes over reasonably hilly terrain, if you cannot do this, then you have quite a ways to go.
I don’t think you should worry too much about the amount you eat, once you do get into the racing you’ll find you simply can’t eat enough, you can easily burn 2500 calories a day in the racing season.
Cycle racing in not completely unlike other sports, but it has some wrinkles in it that need experience, whilst a general fitness coach can take you a long way, you really need more than this, and you also need a companion.
I have raced in various forms of event over many years, and following a long break, I am getting back into it, it’s taken me 6 months to get from utterly abysmal up to well below average - this in terms of club riding, and it will take another year before I can consider being capable of hanging on with the bunch, perhaps longer.
I suggest you join a club, its really the best advice anyone on this board can possibly give you, the knowledge resource you will be able to tap into is so wide and so specific you really can’t consider competitve riding without it.