The over 65s won't lose anything until April 2013.
The current tax allowance, (2011-2012) for the over 65s is £9940.00. It will increase to £10500 in April 2012 for the next financial year (2012-2013). The "loss" will occur when they they get their index linked pension increase in April 2013. Their tax allowance will not increase by proportion to offset this increase therefore they will pay 20% income tax on the whole of the pension increase.
Someone on the state pension won't pay any tax but someone with a private pension on top of the state pension, totalling over £10500.00, will pay more than they otherwise would have had their tax allowances risen in line with inflation.
There is an e-petiton asking the Chancellor to think again on this matter. You can sign it here:-
http://epetitions.dir...ov.uk/petitions/31778
You don't have to be a pensioner to sign this petition but remember, you will be a pensioner one day.