He said there was a "culture and informal pressure of having targets and expectations" in police forces.
Another possibility for the discrepancy was that more low-level crimes were being dealt with informally and outside the formal crime recording system.
Mr Flatley also suggested it was also "possible" that reductions in police budgets and officers meant fewer offences were being recorded.
A spokesman for the Office for National Statistics (ONS) has said that the fall in the average age of mothers since 1973 could be due to several factors:
Possible influences include increased participation in higher education, increased female participation in the labour force, the increasing importance of a career, the rising opportunity costs of child-bearing, labour market uncertainty, housing factors and instability of partnerships.
Just under 50% of women are waiting until they reach 30 to give birth, according to the latest figures from the Office for National Statistics.
In 2010, 48% of all infants born were to mothers aged 30 and over, up from 47% in 2009 and 46% in 2000.
The last time so many babies were born to women of this age was after the Second World War, in 1946.
The proportion of mothers under the age of 25 has fallen steadily since its peak in the early Seventies.
There are warning signs for the police and Home Office, with the increase in theft. And earlier this week the British Retail Consortium's Survey showed an increase of over 15% in the cost of retail crime alongside a drop in the proportion of crime reported by retailers to the police from 48% to 16%.
This is perhaps why the Office for National Statistics has begun to express concern that apparent reductions in police recorded crime may be exaggerated.
Crimes recorded in virtually all categories have fallen in the year ending September 2012 compared with the previous year with significant reductions in vandalism, burglary and vehicle thefts.
Pickpocketing was one of the few sub-categories that saw an increase, which may be due to the popularity of hand-held devices like iPhones, mp3 players and tablets.
- Violence against the person - down 5%
- Homicide - down 10%
- Attempted murder - down 2%
- Burglary - down 8%
- Anti-social behaviour incidents - down 2.4%
- Pickpocketing - up 6%
(Office for National Statistics)
The crime prevention minister Jeremy Browne has welcomed the latest figures from the Office for National Statistics, saying:
Police reform is working. We have swept away central targets, reduced bureaucracy and these figures show forces are rising to the challenge of doing more with less. Many have achieved significant reductions in crime with reduced budgets.
Police records "overstate the true rate in which crime has been falling" according to the latest analysis from the Office for National Statistics.
The number of crimes recorded by police and those reported by residents in England and Wales both show the number of crimes is falling, but at different rates.
Police records suggest that crime rates dropped by 41% since 2002/03, compared to a 26% fall in the records of the Crime Survey for England and Wales.
In the last five years, the number of police-recorded crimes fell by 960,000, while the crime survey showed a fall of just 560,000.
Just over half (53%) of all babies registered in 2011 were born to parents who were married or in a civil partnership, according to figures from the ONS.
The figure is a substantial drop from 1986 when the proportion was closer to 80%.
However, the number of births registered by sole parents (almost 6%) has fallen since 2001 while more parents are co-habiting (31%).
The average age of mothers in England and Wales in 2011 was 29.7 years, according to the most recent figures from the Office for National Statistics. The average age of first-time mothers was 27.9.
Nearly half of all births in 2011 (49%) were to mothers over the age of 30, according to the latest figures from the Office for National Statistics.
For fathers, nearly two-thirds (65%) were over the age of 30.