If I recall correctly, since it has been many years, old sealant can loose its intended properties; adhesive strength, solvent resistance, shear strength, etc.
Out of shelve life date sealant can be tested (tack free time, shear strength, viscosity, hardness) to extend the shelve life, but I have never seen the date extended more than 6 months.
And yes, it is accepted practice that sealant shelve life can be extended by lower storage temperatures.
RV-7 Slow Build
Empannage - completed
Wings - completed
VAF Dues - current