A recent survey of 600 people by GrownUps website - a community website for the over-50s - revealed 46 per cent of respondents planned to take their money out of KiwiSaver as soon as they turned 65 and became eligible.
Gawith said investors did not have to take all of their money out and he expected some people to keep contributing at the same rate if they were still working.
Those who are eligible to get their money out no longer get the Government contribution and employers do not have to keep contributing either.
Gawith said some savers were also planning to add other money to their KiwiSaver fund such as other superannuation money or endowments.
"We see a consolidation of savings into KiwiSaver."
Gawith said KiwiSaver was a cheap and flexible way to manage retirement savings. Each scheme has different rules about how much can be withdrawn in a regular payment but most start at either $50 or $100. Gawith said balances in KiwiSaver were still small and he expected many savers to treat the money as a bonus rather than core retirement savings.
Gareth Morgan Investments has launched a cash plus investment option targeting over 65s who want to keep their money in KiwiSaver but take a conservative investment approach.