It's certainly not old.
Here is the specs page, hope this helps.
http://support.gateway.com/s/Mobile/Gateway/4000Series/4820sp3.shtml
== SYSTEM IDENTIFICATION ==
Serial: **********
Model: Gateway 4542GP
BIOS: Phoenix 53.01.04 03/24/2005
CPU: Intel Pentium M, 1600 MHz
== OS AND BROWSER ==
OS version: Windows XP 5.1.2600 Service Pack 2
First installed: Sat Oct 22 15:42:32 EDT 2005
Browser: MSIE 7.0; Windows NT 5.1; .NET CLR 1.1.4322; .NET CLR 2.0.50727
== MEMORY ==
Total RAM: 512MB (BIOS), 479MB (Windows)
Resources: 90 %
Memory slots: Not reported by the SMBIOS
== DRIVES ==
C:\ (NTFS) 72174 MB total, 17691 MB free
D:\ (FAT32) 4133 MB total, 1455 MB free
E:\ (CD-ROM)
== DEVICES ==
1394: IEEE 1394 OHCI Compliant Host Controller Vendor OHCI Compliant IEEE 1394 Host Controller (7-1-2001)
BATTERY: Microsoft AC Adapter (7-1-2001)
BATTERY: Microsoft ACPI-Compliant Control Method Battery (7-1-2001)
BLUETOOTH: IVT Corporation Bluetooth HID Manager (7-29-2004)
BLUETOOTH: IVT Corporation Bluetooth VComm Manager (7-29-2004)
CDROM: HL-DT-ST DVD-RW GCA-4080N (7-1-2001)
COMPUTER: Advanced Configuration and Power Interface (ACPI) PC (7-1-2001)
DISKDRIVE: FUJITSU MHT2080AT (7-1-2001)
DISPLAY: Intel Corporation Intel(R) 82852/82855 GM/GME Graphics Controller (2-10-2004)
DISPLAY: Intel Corporation Intel(R) 82852/82855 GM/GME Graphics Controller (2-10-2004)
HDC: Intel(R) 82801DBM Ultra ATA Storage Controller - 24CA (11-14-2003)
HDC: Primary IDE Channel (7-1-2001)
HDC: Secondary IDE Channel (7-1-2001)
HIDCLASS: IVT Corporation Bluetooth HID Enum Device (7-29-2004)
HIDCLASS: Microsoft HID-compliant consumer control device (7-1-2001)
MEDIA: Analog Devices, Inc. SoundMAX Integrated Digital Audio (1-13-2004)
MEDIA: IVT Corporation. Bluetooth AV/HS Audio ()
MEDIA: QSound Labs, Inc. Aurilium Sound Agent 2 (WDM) (8-5-2003)
MODEM: CXT Conexant SoftK56 Data Fax Modem (12-15-2003)
MODEM: IVT Corporation Bluetooth DUN Modem (7-29-2004)
MODEM: IVT Corporation Bluetooth Fax Modem (7-29-2004)
MODEM: IVT Corporation Bluetooth LAP Modem #2 (12-8-2004)
MODEM: IVT Corporation Bluetooth LAP Modem (12-8-2004)
MONITOR: Default Monitor (6-6-2001)
MONITOR: Digital Flat Panel (1024x768) (6-6-2001)
MOUSE: Microsoft HID-compliant mouse (7-1-2001)
MOUSE: Synaptics PS/2 Port TouchPad (3-26-2004)
NET: IVT Corporation Bluetooth PAN Network Adapter (7-29-2004)
*** PROBLEM CODE 22 ***
NET: Intel(R) Corporation Intel(R) PRO/Wireless 2200BG Network Connection (1-2-2004)
NET: Microsoft Bluetooth PAN Network Adapter - Packet Scheduler Miniport (7-1-2001)
NET: Microsoft Direct Parallel (7-1-2001)
NET: Microsoft Intel(R) PRO/Wireless 2200BG Network Connection - Packet Scheduler Miniport (7-1-2001)
NET: Microsoft Loopback Adapter (7-1-2001)
NET: Microsoft Realtek RTL8139/810x Family Fast Ethernet NIC - Packet Scheduler Miniport (7-1-2001)
NET: Realtek Semiconductor Corp. Realtek RTL8139/810x Family Fast Ethernet NIC (9-4-2003)
PCMCIA: RICOH Ricoh R/RL/5C476(II) or Compatible CardBus Controller (7-1-2001)
PCMCIA: RICOH Ricoh R/RL/5C476(II) or Compatible CardBus Controller (7-1-2001)
USB: Intel(R) 82801DB/DBM USB 2.0 Enhanced Host Controller - 24CD (6-1-2002)
USB: Intel(R) 82801DB/DBM USB Universal Host Controller - 24C2 (7-1-2001)
USB: Intel(R) 82801DB/DBM USB Universal Host Controller - 24C4 (7-1-2001)
USB: Intel(R) 82801DB/DBM USB Universal Host Controller - 24C7 (7-1-2001)
==END==