Its obvious this "GURU" pro mechanic with 40 years of experience hasn't
read the Bicycle FAQ:

What advantage is there in aging tubulars?
None! The aging concept arose from the same source as the "steel frames
need to be replaced because they get soft with age" concept. Both were
intended to improve sales during the off (winter) season by bike shops
with too much inventory on their shelves. Tires oxidize, outgas, and
polymerize from ultraviolet light. The concept of a tire manufacturer
making a tire that cannot be used until ripened for six months from the
date of purchase is ridiculous. Tires can be made to any specification
at the factory. Tires are most flexible and durable when they are new.
They don't improve with time and exposure to heat, light, and oxygen or
ozone.

"Over-aged" tubular tires, have crumbling hard brown latex on their
sidewalls that exposes separating cords directly to weather and wear
and they have treads crack when flexed. Considering that this is a
continuous process, it is hard to explain where, in the time from
manufacture to the crumbly condition, the optimum age lies. The claim
that tires are lighter after aging is true. Their elastomers have
evaporated making the tire brittle and weak.

Purchasing tubular tires in advance to age them is unwise, although if
there is a supply problem, tubular tires bought in advance should be
sealed tightly in airtight bags and kept in the dark, optimally in a
freezer. For best results, use new tires because aged tires are only as
good as how little they have aged.

http://www.sheldonbrown.com/brandt/tubular-fables.html