I too never fancied wearing lycra being 54 and thought it would look stupid so prefered Ron Hills, but I took the plunge and it was the best thing I ever did. It somehow swelled my confidence cycling and now when I hear a car behind I have a tendency to peddle faster, I like to think there's a bird behind admiring my physique and by going faster I stay in front a bit longer prolonging her view. Gods knows what they think when they get in front and see its an old perve.
In reality though do not be put off by what others might think, just get out and do it. The biggest majority of the people who see you out on the roads when you get away from home do not know you so it does not matter, wear a peaked cap and sunglasses and just dip your head and hide behind the peak.
One top tip though with tights, always make sure your seams are straight, I went out last weekend and no matter what I could not get the seam on my left leg to match my right no matter how many times I put my left leg in, a problem I have never encountered before. After 20 miles I started to get very sore between my legs and by time I got home after 50 I was in real agony. It turned out that my left leg was back to front making it twist a bit between my legs. Lesson well learrned.