Pension investors have been shunning Barclays plc (LON: BARC) shares. Here's why I think that's a big mistake. : It’s been many years since the full State Pension, currently a little over £8,500 per year, has been seen as enough to get us comfortably through our more mature years. And with the age at which we qualify for it steadily rising, the sooner we plan for retirement the better.