___┌1970年で10歳ののび太
1960_00
1961_01
1962_02
1963_03
1964_04
1965_05
1966_06
1967_07
1968_08
1969_09┌─→┐__┌1980年で10歳ののび太
1970_10↑10←20__00
1971_11│11_21__01
1972_12│12_22__02
1973_13│13_23__03
1974_14│14_24__04
1975_15│15_25__05
1976_16│16_26__06
1977_17│17_27__07
1978_18│18_28__08
1979_19↑19_29__09┌─→┐__┌1990年で10歳ののび太
1980_20┘20_30__10↑10←20__00
1981___21_31__11│11_21__01
1982___22_32__12│12_22__02
1983___23_33__13│13_23__03
1984___24_34__14│14_24__04
1985___25_35__15│15_25__05
1986___26_36__16│16_26__06
1987___27_37__17│17_27__07
1988___28_38__18│18_28__08
1989___29_39__19↑19_29__09┌─→┐__┌2000年で10歳ののび太
1990___30_40__20┘20_30__10↑10←20__00
1991___31_41____21_31__11│11_21__01
1992___32_42____22_32__12│12_22__02
1993___33_43____23_33__13│13_23__03
1994___34_44____24_34__14│14_24__04
1995___35_45____25_35__15│15_25__05
1996___36_46____26_36__16│16_26__06
1997___37_47____27_37__17│17_27__07
1998___38_48____28_38__18│18_28__08
1999___39_49____29_39__19↑19_29__09┌─→┐__┌2010年で10歳ののび太
2000___40_50____30_40__20┘20_30__10↑10←20__00
2001___41_51____31_41____21_31__11│11_21__01
2002___42_52____32_42____22_32__12│12_22__02
2003___43_53____33_43____23_33__13│13_23__03
2004___44_54____34_44____24_34__14│14_24__04
2005___45_55____35_45____25_35__15│15_25__05
2006___46_56____36_46____26_36__16│16_26__06
2007___47_57____37_47____27_37__17│17_27__07
2008___48_58____38_48____28_38__18│18_28__08
2009___49_59____39_49____29_39__19↑19_29__09┌─→┐
2010___50_60____40_50____30_40__20┘20_30__10↑10←20
2011___51_61____41_51____31_41____21_31__11│11_21
2012___52_62____42_52____32_42____22_32__12│12_22
2013___53_63____43_53____33_43____23_33__13│13_23
2014___54_64____44_54____34_44____24_34__14│14_24
2015___55_65____45_55____35_45____25_35__15│15_25
2016___56_66____46_56____36_46____26_36__16│16_26
2017___57_67____47_57____37_47____27_37__17│17_27
2018___58_68____48_58____38_48____28_38__18│18_28
2019___59_69____49_59____39_49____29_39__19↑19_29
2020___60_70____50_60____40_50____30_40__20┘20_30